2. 外语
  3. Tom ______ better than to ask his brother to help at such a critical moment.

Tom ______ better than to ask his brother to help at such a critical moment.

admin2008-10-11  64
问题 Tom ______ better than to ask his brother to help at such a critical moment.
选项 A、shall
B、has known
C、shouldn’t
D、should have known
答案A
解析 shall用做情态动词，意为“必须，必将”。
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